Kelly, who died at 43, played bad girl Laurie Forman during the Fox sitcom that aired from 1998 to 2006, wrote USA Today. In real life, she suffered from substance abuse and was arrested for suspicion of drunk driving, assault and alleged domestic abuse, according to USA Today.

The Los Angeles County coroner's office told TMZ that Kelly's death has been ruled accidental, but the full report will not be completed for another two weeks.

TMZ reported that Kelly's autopsy failed to identify the exact cause of death and the coroner declined to identify which drugs were in her system from a toxicology report. The celebrity website reported that shortly before her death, Kelly had been hospitalized with a blood alcohol level of 0.34.

Most states consider someone legally drunk with a blood alcohol level of 0.08 or higher, according to NBC News.

When Kelly died in August, her agent Craig Wyckoff told People magazine that she had "addiction problems that have plagued her these past few years." Wyckoff said Kelly had voluntarily checked herself into a treatment facility the week before she died.

Kelly's estranged husband Robert Gilliam told TMZ he offered his wife help for alcohol abuse for years as he and her boyfriend blamed each other for her relapse. Gilliam told the celebrity website that he wanted her to into a rehab facility in North Carolina, where they lived.

Kelly had filed for divorce from Gilliam in July, according to an Aug. 15 TMZ.com story. TMZ reported that Gilliam was convicted of domestic battery in July and sentenced to three years probation. The website stated he also served 35 days in jail for the assault.